Finding the Fourth Proportional to 9,391.68, 12,960.72 and 5,200.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.68 : 12,960.72 = 5,200.20 : x
2. Step 2: Convert to fraction form
   9,391.68/12,960.72 = 5,200.20/x
3. Step 3: Cross multiply
   9,391.68x = 12,960.72 × 5,200.20
4. Step 4: Simplify right side
   9,391.68x = 67,398,336.14
5. Step 5: Solve for x
   x = 67,398,336.14/9,391.68
6. Step 6: Final answer
   x = 7,176.39